Pressure Probe and System for Measuring Large Blast Waves

摘要

A new pancake-type pressure probe was developed for the measurement of blast pressure waves during the BIG SEA sled tests. This probe employs transducers of the type selected for wing pressure measurements in that program. It was evaluated in the shock tube under a range of flow Mach numbers encountered during the test. From these shock tube tests, a probe form calibration was determined. Application of this type of probe to the BIG SEA tests is also described, including the mounting system, transducer and electronic calibration, and one blast wave record derived from this type of probe is presented. The results of the shock-overpressure measurements are compared with other test data. The pancake probe has a diameter of 4 inches and a thickness of 0.5 inch. The accuracy of measurement has been determined to be 3-5% of the shock overpressure for blast waves where the positive duration is 10 milliseconds or greater. The response time has been found to be less than 0.7 milliseconds. (Author)